Stuck frozen car doors

Propylene Glycol and glycerin mixedand wiped or sprayed on does the
trick The glycerin thickens it up and keeps it in place, as well as
lubricating the rubber.
Vaselene is NOT good for the seals - it will rot the rubber, as will
WD40.
Silicone is a real bugger if you need to do any paint work on the car
in the next ten years or so.
Glycerin and Propylene glycol are both rather innocuous and do not
harm the paint or the rubber.
Don't stain your clothes too badly either if you rub against the
rubber getting in or out.

Rub a candle on the door frame. It will conform to the contours.
It's easier to control the application than using silicone spray, and
both wreak havoc with repainting, so it's good in the long term to put
the stuff only where you really need it.
R

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